JP3254036B2 - Detent spring mounting structure for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a detent spring which is provided to be engageable with a manual plate for switching a range position in an automatic transmission such as a vehicle.

[0002]

2. Description of the Related Art In an automatic transmission, a manual plate connected to a select lever operated by a driver is rotatably supported by a transmission case for switching a range position. According to the turning position of the manual plate, the manual valve of the hydraulic circuit connected to the manual plate is operated, and the range position is switched. A corrugated portion is formed on the outer peripheral edge of the manual plate so that a detent spring extending from a fixed portion of a transmission case or a valve is engaged with the corrugated portion to provide a sense of moderation during selection and to maintain a selected position. It has become.

As a mounting structure of the detent spring, there is one disclosed in Japanese Utility Model Laid-Open No. 62-8866, for example. That is, as shown in FIG. 7, a screw hole is formed in the fixing portion 23 of the transmission case, and the bolt 27 is inserted through a hole provided in the detent spring 21.
Is screwed into the screw hole. Further, a hole is provided in the detent spring 21 at a predetermined interval, and a pin 29 is driven and pressed into a pin hole 25 formed in the transmission case through the hole of the detent spring 21.

As a result, the detent spring 21 is fixed by the bolt 27 and the hole of the detent spring is engaged with the pin 29, so that the detent spring 21 is prevented from rotating at the mounting portion. As a result, the leading end of the detent spring is securely engaged with the outer peripheral edge corrugated portion 30a of the manual plate 30 without displacement.

[0005]

However, in such a conventional detent spring mounting structure,
The pin is driven into the pin hole formed in the transmission case by press-fitting and held, so the man-hour of press-fitting work is required, and since the pin is held by press-fitting, it may fall out in some cases. There was a problem from the viewpoint of reliability and reliability.

As a countermeasure against this, the applicant filed a Japanese patent application No. 64-1
No. 8322 proposes a mounting structure using a stepped pin. That is, as shown in FIG.
A bolt 27 is provided through one of the holes provided in the detent spring 31 and screwed into the fixing portion 33 of the transmission case. A positioning pin 39 is fitted into the other hole 32 of the detent spring 31. In the mounting structure described above, the pin 39 has a stepped shape including a small diameter portion 39a and a large diameter portion 39b.
b fits into the pin hole 35 provided in the fixed portion of the transmission case, and the small diameter portion 39a fits into the hole 32 of the detent spring.

On the detent spring 31, a spacer 40 having holes corresponding to the above holes is superimposed.
Bolt 27 is connected to detent spring 31 and spacer 40
At the same time, the deformation of the detent spring 31 is suppressed by the spacer 40.
As a result, the large-diameter portion 39b fitted into the pin hole 35 provided in the fixing portion is prevented from being detached from the hole by the detent spring 31 fixed by bolts.
Is prevented from coming off.

However, in this mounting structure, although the pin is prevented from falling off, the pin must be formed in a stepped shape having a small-diameter portion and a large-diameter portion, and the processing cost increases. is there. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an improved automatic transmission detent spring mounting structure that is highly reliable, inexpensive, and free of pins coming off in view of the above problems. .

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a mounting structure for a detent spring fixed to a transmission case or a valve so as to be engageable with a manual plate for switching a range position. A screw hole and a pin hole are formed in a fixing portion of the valve, a pin having a single diameter is inserted into the pin hole, and a bolt hole corresponding to the screw hole and a hole corresponding to the pin are formed in the detent spring. Is provided, a spacer having a bolt hole corresponding to the screw hole is superimposed on the detent spring placed on the fixing portion, and the bolt is inserted through each bolt hole of the spacer and the detent spring. The spacer is screwed into the screw hole, and the spacer has an engaging portion that engages with a pin that protrudes through the hole of the detent spring. Blocking portion for blocking the movement of a predetermined or more axial was assumed to be formed.

[0010]

The spacer having a bolt hole corresponding to the screw hole of the fixing portion is superimposed on the detent spring, and the spacer and the detent spring are fixed to the fixing portion with bolts that penetrate these and are screwed into the screw holes. The detent spring is positioned by penetrating a pin of a single diameter inserted into the pin hole of the fixed portion. The spacer has its engaging portion engaged with the pin protruding through the detent spring, and the blocking portion prevents the pin from moving, so that the pin does not fall out.

[0011]

1 and 2 show a first embodiment of the present invention. In particular, FIG. 1A shows a plan view, and FIG. 1B shows an enlarged cross section of AA section in FIG. A detent spring 1 made of a thin elastic material is provided with a roller 2 at its tip for engaging a manual plate for switching a range position (not shown), and a mounting base at the other end is provided in a direction perpendicular to the longitudinal direction of the detent spring. Two holes 3, 4 are formed.

A screw hole 7 and a pin hole 8 corresponding to the two holes 3 and 4 are formed in the fixing portion 6 of the transmission case, and the pin hole 8 has a single diameter for positioning. Pin 5
Is inserted, and the tip of the pin 5 projects above the mounting surface of the fixing portion 6. The pin 5 protruding from the pin hole 8 is passed through the hole 4 to position the detent spring 1, and a spacer 10 having a hole 13 corresponding to the screw hole 7 is overlaid on the detent spring 1,
The detent spring 1 is sandwiched and fixed between the spacer 10 and the transmission case fixing portion 6 by screwing and tightening the bolt 12 that has passed through the holes 13 and 3 of the detent spring 1 and the detent spring 1 into the screw hole 7.

At this time, the spacer 10 is provided with a bag portion 14 corresponding to the pin hole 8 of the fixing portion 6, and when tightening with the bolt 12, the detent spring 1
The bag portion 14 covers the pin 5 that protrudes through the hole 4.
The bag portion 14 is formed by pressing the main body portion 1 of the spacer 10.
1 and has a hat-shaped cross section. As shown in FIG. 2, holes 3 and 1 through which bolts 12 of detent spring 1 and spacer 10 respectively pass.
Reference numeral 3 denotes an elongated hole for absorbing errors of each member with respect to the dimension between the bolt 12 and the pin 5. In this embodiment configured as described above, when attaching the detent spring 1 to the fixed portion 6 of the transmission case, the detent spring hole 4 is inserted into the pin 5 protruding from the pin hole 8 of the fixed portion 6, Next, a spacer 14 is placed on the detent spring 1 and a bag 14
, And the spacer 1 is
0 and the detent spring 1 are fixedly fastened to the fixing portion 6.

As a result, the tip of the pin 5 inserted into the pin hole 8 of the fixing portion 6 is accommodated in the bag portion 14 of the spacer 10 fixed by the bolt 12, and the pin 5 tends to move in the axial direction. Then, the tip of the pin comes into contact with the top surface 17 of the hat of the bag portion 14 and is blocked. Therefore, the detachment is prevented by the spacer 10 even if the pin does not have a stepped shape as in the related art. For this reason, the processing cost of the pin 5 is reduced. The bag portion 14 for accommodating the tip of the pin 5 constitutes the engaging portion of the invention, and the hat top surface 17 of the bag portion 14 constitutes the blocking portion.

FIGS. 3 and 4 show a modified example of the spacer as the second embodiment. Particularly, FIG. 3A is a plan view,
(B) shows an enlarged cross section of a BB portion in (a). In the previous embodiment, a bag having a hat-shaped cross section is formed in the spacer to accommodate the tip of the pin.
Instead, a claw 18 caused by pressing the spacer body portion 11 'is provided as a blocking portion. The width d of the notch 15 that caused the claw 18 is slightly wider than the diameter of the pin 5 as an engaging portion, and the tip of the claw 18 is bent so as to be substantially parallel to the main body 11 ′. It is located on the axial extension of the diameter pin 5. Other configurations are the same as those of the first embodiment.

In this embodiment configured as described above, the pin 5 projecting from the pin hole 8 of the fixing portion 6 through the hole 4 of the detent spring is housed in the notch 15 of the spacer 10 '. You. Thereby, the spacer 1
In the position 0 ', the notch 15 is engaged with the pin 5 to hold the position, and when the pin 5 tries to move in the axial direction, the tip of the pin abuts on the claw 18 and is blocked. Therefore, also with this, the detachment is prevented by the spacer 10 'without forming the pin in a stepped shape. In the illustrated embodiment, the claw 18 overlaps the entire diameter of the pin when viewed from the axial direction of the pin 5. However, the claw 18 is not limited to this, and if it overlaps a part of the diameter of the pin, the claw 18 functions as a blocking portion. Be demonstrated.

FIGS. 5 and 6 show a third embodiment. In particular, FIG. 5A shows a plan view, and FIG. 5B shows an enlarged cross section of a portion C-C in FIG. A spacer 1 having a hole 13 corresponding to the screw hole 7 of the fixing portion and a hole 16 corresponding to the pin hole 8 on the detent spring 1.
0 ”is superimposed, and a bolt 12 that has penetrated through the holes 13 and 3 of the spacer 10 ″ and the detent spring 1 is screwed into the screw hole 7 and tightened, so that the detent spring 1 is located between the spacer 10 ″ and the transmission case fixing portion 6. Is sandwiched and fixed.

At this time, a pin 5 having a single diameter protruding from the pin hole 8 of the fixing portion 6 through the hole 4 of the detent spring.
Is fitted in the hole 16 of the spacer 10 ″. The spacer 10 ″ is formed with a folded piece 19 whose end is folded back from the main body 11 ″ and extends over the hole 16. Among them, the hole 16 constitutes the engaging portion of the invention, and the folded piece 19 constitutes the blocking portion, and the other configuration is the same as that of the first embodiment.

With the above construction, the hole 16 is engaged with the pin 5 to hold the position of the spacer 10 ". When the pin 5 attempts to move in the axial direction, the tip of the pin abuts on the folded piece 19 to prevent it. Therefore, according to this embodiment as well, the spacer is prevented from coming off without forming the pin 5 in a stepped shape, and the folded piece 19 in the embodiment completely covers the hole 16, but the pin shaft is not used. In the above-described embodiments, the fixed portion for attaching the detent spring is provided on the transmission case, but the blocking portion is provided on the transmission case. Without being limited, if it is a fixed side with respect to the manual plate,
In addition to the transmission case, a valve fixed to the transmission case may be used.

[0020]

As described above, according to the present invention, a screw hole and a pin hole are formed in a fixed portion of a transmission case or a valve, and a single-diameter pin is inserted into the pin hole, while the detent spring is mounted. The spacer is overlapped with a bolt and fixed by a bolt, and the spacer includes an engaging portion that engages with a pin that protrudes through the hole of the detent spring, and a blocking portion that prevents the pin from moving in a predetermined axial direction or more. Since the pin is provided, even if a pin having a single diameter without a step is used, the pin is prevented from falling off by the blocking portion of the spacer. This has the effect of maintaining high reliability, eliminating the need for stepping with a single diameter pin, and reducing costs.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a detent spring and a spacer according to the first embodiment.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a view showing a detent spring and a spacer according to a second embodiment.

FIG. 5 is a diagram showing a third embodiment of the present invention.

FIG. 6 is a view showing a detent spring and a spacer according to a third embodiment.

FIG. 7 is a diagram showing a conventional example.

FIG. 8 is a diagram showing another conventional example.

[Explanation of symbols]

 Reference Signs List 1 detent spring 2 roller 3, 4 hole 6 fixing part 7 screw hole 8 pin hole 10, 10 ', 10 "spacer 11, 11', 11" main body part 12 bolt 13 hole 14 bag part 15 cutout 16 hole 17 hat top Surface 18 Claw 19 Folded piece 21, 31 Detent spring 23, 33 Fixing part 25, 35 Pin hole 27 Bolt 29, 39 Pin 30 Manual plate 30a Corrugated part 32 Hole 39a Small diameter part 39b Large diameter part 40 Spacer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 59/10 G05G 5/03 B60K 20/02

Claims (4)

(57) [Claims] 1. A mounting structure for a detent spring fixed to a transmission case or a valve so as to be engageable with a manual plate for range position switching, wherein a screw hole and a pin hole are formed in a fixing portion of the transmission case or the valve. A pin having a single diameter is fitted into the pin hole, a bolt hole corresponding to the screw hole and a hole corresponding to the pin are provided in the detent spring, and the detent spring is mounted on the fixing portion. A spacer having a bolt hole corresponding to the screw hole is superimposed on the detent spring, and a bolt is screwed into the screw hole through the spacer and each bolt hole of the detent spring. an engaging portion which pins engage which protrude through the holes of the detent spring, to prevent movement of more than a predetermined axial direction of the pin Detent spring mounting structure for an automatic transmission characterized in that it includes a blocking portion. 2. The method according to claim 1, wherein the engaging portion comprises a hat-shaped bag formed on a main body of the spacer, and the blocking portion comprises a hat top surface of the bag. 2. The detent spring mounting structure of the automatic transmission according to 1. 3. The device according to claim 1, wherein the engaging portion comprises a notch provided in a main body of the spacer, and the blocking portion comprises a claw raised from the notch. A detent spring mounting structure for the automatic transmission according to the above. 4. The device according to claim 1, wherein the engaging portion comprises a hole formed in a main body of the spacer, and the blocking portion comprises a folded piece having an end of the main body folded. Item 2. A detent spring mounting structure for an automatic transmission according to item 1.